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cap plus single site

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johnny1225
Posts: 222
Joined: Thu Jul 22, 2004 8:27 am

cap plus single site

Postby johnny1225 » Thu Jan 25, 2018 4:56 pm

I have a system with a XPR8400 UHF Repeater. Capacity Plus single site with XPR6550 and XPR3500 radios. This system was put in about 3 years ago. System is simple 50/50 splitter with antenna on roof and antenna in basement. System worked very well but now the radios are intermitting flashing out of range sometimes. I have checked the repeater and systems to be find but i put a loaner repeater in and it seems it is doing the same thing. Would this look like a antenna problem?

John

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Bill_G
Posts: 3083
Joined: Thu Sep 17, 2009 5:00 am

Re: cap plus single site

Postby Bill_G » Fri Jan 26, 2018 5:12 am

An Anritsu or equivalent would tell you if it's an antenna problem. Could be cochannel interference. Listen to the channel in analog while another radio reports out of range.

RFguy
Posts: 1314
Joined: Wed Dec 21, 2005 6:17 am

Re: cap plus single site

Postby RFguy » Fri Jan 26, 2018 10:08 am

We program all digital repeaters with a second channel in analog mode, same frequencies.

Using channel steering on the rear connector, change to the analog channel and do a site noise/TX de-sens check. Check forward/reflected power at the repeater output and after the duplexer/multicoupling.

This may help you get a baseline on the system performance.

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FatBoy
Posts: 205
Joined: Tue Sep 04, 2001 4:00 pm

Re: cap plus single site

Postby FatBoy » Tue Jan 30, 2018 3:54 pm

Antenna system or co-channel interference on TX or RX freqs. I have had more than my fair share of in-building antenna/cables get damaged. Especially in a power divided install, if any part of the antenna system is compromised; then the whole antenna system goes off the rails. I would measure power into and out of each port on the divider and at each antenna. You can use a standard analog watt meter on the repeater output......FB
......I understand what the package says sir, but you cannot talk 28 miles with 3 AA batteries.......


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